This is a simple c++ program for 2 player game tic tac toe. Both the players in this program are manual.

TicTacToe.cpp

#include<iostream>
#include<stdlib.h>
using namespace std;
char array[9],turn = 'X'; //turn determines which player has to play
int chance = 1;
void display(){
int i;
cout<<endl;
	for(i=1;i<=9;++i){
			cout<<"\t"<<array[i]<<"   "; //just an indentation thing
			if(i%3 == 0)
				cout<<"\n\n";
			}
}
void check(){
int i;
	for(i=1;i<=9;i=i+3){ //check rows
		if(array[i] == turn && array[i] == array[i+1] && array[i] == array[i+2]){
				cout<<"\n\n**"<<turn<<" WINS ** \n\n";
			display();
			exit(1);
		}
	}
for(i=1;i<=3;++i){ //check columns
		if(array[i] == turn && array[i] == array[i+3] && array[i] == array[i+6]){
			cout<<"\n\n**"<<turn<<" WINS ** \n\n";
			display();
			exit(1);
		}
}
if(array[1] == turn && array[1] == array[5] && array[1] == array[9]){ //checks diagonals
			cout<<"\n\n**"<<turn<<" WINS ** \n\n";
		display();
		exit(1);
	}
if(array[3] == turn && array[3] == array[5] && array[3] == array[7]){
		cout<<"\n\n**"<<turn<<" WINS ** \n\n";
		display();
		exit(1);
	}
}
void play(){
int block;
	cout<<"\nPlayer "<<turn<<" pick a block : ";
	cin>>block;
		if(array[block] == 'X' || array[block] == 'O'){
			cout<<"\nAlready selected! please enter another choice";
		}
			else{
				array[block] = turn;
					if(chance >=5)
					check();
					chance++;
					if(chance == 10){
						display();
						cout<<"\nSorry! game ended! Its a draw\n ";
					}
					if(chance % 2 == 0)
						turn = 'O';
						else
							turn = 'X';
			}
			display();
}
int main(){
int i,j=49;
	cout<<"\nPlayer 1 : X"<<"\nPlayer 2 : O \n";
	for(i=1;i<=9;++i){ //initialization to numerals for player conveniece
		array[i] = (char)j;
		++j;
	}
	display();
	while(1)
		play();
	display();
}